Key button



Fig. 2.1 is a perspective view;

Fig. 2.2 is a side view;

Fig. 2.3 is a side view;

Fig. 2.4 is a side view;

Fig. 2.5 is a side view;

Fig. 2.6 is a top view; and

Fig. 2.7 is a bottom view.

The broken lines in the drawings depict unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a key button, as shown and described. 